package com.heima.admin.gateway.filter;

import com.heima.admin.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //判断是否为登录
        if(request.getURI().getPath().contains("login")){
            //放行
            return chain.filter(exchange);
        }

        //校验token是否存在
        String token = request.getHeaders().getFirst("token");
        if(StringUtils.isEmpty(token)){
            //返回401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //token是否有效
        try {
            Claims claims = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claims);
            if(result == 1 || result == 2){
                //返回401
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        }catch (Exception e){
            e.printStackTrace();
            //返回401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置 值越小，优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
